| Code | County or town | Old Style |
| C | County Cork | |
| CE | County Clare | |
| CN | County Cavan | |
| CW | County Carlow | |
| D | County Dublin | |
| DL | County Donegal | |
| G | County Galway | |
| KE | County Kildare | |
| KK | County Kilkenny | |
| KY | County Kerry | |
| L | Limerick city | |
| LD | County Longford | |
| LH | County Louth | |
| LK | County Limerick | |
| LM | County Leitrim | |
| LS | County Laois | |
| MH | County Meath | |
| MN | County Monaghan | |
| MO | County Mayo | |
| OY | County Offaly | |
| RN | County Roscommon | |
| SO | County Sligo | |
| T | County Tipperary | |
| TN | County Tipperarynorth riding | |
| TS | County Tipperarysouth riding | |
| W | Waterford city | |
| WD | County Waterford | |
| WH | County Westmeath | |
| WW | County Wicklow | |
| WX | County Wexford | |
